strlenf

True but its very clumsy for large number of parameters. Even more importantly, its not forward compatible. For example, cbrt() cant reliably expanded to support bigints or any private types.

Here is my not-very-novel proposal for function overriding only. Its backward/forward compatible and free of name-mangling.

  void qsort_i8 ( i8 *ptr, int num);
  void qsort_i16(i16 *ptr, int num);
  void qsort_i32(i32 *ptr, int num);
  void qsort_i64(i64 *ptr, int num);
  
  #if __has_builtin(__builtin_overridable)
  __builtin_overridable(qsort, qsort_i8, qsort_i16); // qsort resolves to qsort_i8 qsort_i16
  // qsort() is forward compatible and upgradable with your own types
  __builtin_overridable(qsort, qsort_i32, qsort_i64); // qsort resolves to qsort_i8 qsort_i16 qsort_i32 qsort_i64 
  #endif
  
  i8  *ptr0; int num0;
  i16 *ptr1; int num1;
  i32 *ptr2; int num2;
  i64 *ptr3; int num3;
  
  qsort(ptr0, num0); // call qsort_i8()
  qsort(ptr1, num1); // call qsort_i16()
  qsort(ptr2, num2); // call qsort_i32()
  qsort(ptr3, num3); // call qsort_i64()

You probably want to use simd-optimized pixman[1] for rendering rectangles and glyphs. There is also luigi[2] which draws without opengl and written in C.

[1] https://github.com/freedesktop/pixman [2] https://github.com/nakst/luigi